纤维对混凝土抗冻耐久性的影响研究综述

摘要

纤维混凝土近年来在工程中大量应用,其抗冻性能受到学者们的广泛关注.对混凝土冻融破坏机理中的经典理论进行综述,并全面总结了纤维改善混凝土抗冻性能的机理,分析了冻融环境中,单一因素条件下单掺钢纤维和单掺聚丙烯纤维及混杂纤维(钢纤维+聚丙烯纤维)对混凝土宏观抗冻性能以及微观结构的影响,并对双重因素(冻融与盐溶液、冻融与荷载)耦合作用下纤维对混凝土抗冻性能的影响进行了归纳与探讨,在此基础上提出了纤维混凝土中有待解决的问题.%In recent years,a large number of fiber reinforced concrete (FRC)were applied in project,especially the frost resistance of FRC attracted more and more attention from scholars.It summarized the classic theory of concrete's freezing and thawing destruction property and the mechanism about how fiber affect and improve the frost resistance of the concrete.It specially analyzed the influence of mono fiber (steel fiber,polypropylene fiber) and hybrid fiber (steel fiber + polypropylene fiber) on the macro frost resistance performance and micro structure of concrete's separately,then discussed the effect of fiber on the frost resistance of concrete considering the coupling effect of double factors (freeze-thaw cycles and salt suction,freeze-thaw cycles and load).In addition,some problems to be solved about FRC were proposed.